Hannah, independent, headstrong, and determined not to follow in the footsteps of her bitterly divorced mother, has always avoided commitment. But one hot New York summer she meets Mark Reilly, a fellow Brit, and is swept up in a love affair that changes all her ideas about what marriage might mean. Now, living in their elegant, expensive London townhouse and adored by her fantastically successful husband, she knows she was right to let down her guard. But when Mark does not return from a business trip to the U.S. and when the hours of waiting for him stretch into days, the foundations of Hannah's certainty begin to crack. Why do Mark's colleagues believe he has gone to Paris not America? Why is there no record of him at his hotel? And who is the mysterious woman who has been telephoning him over the last few weeks? Hannah begins to dig into her husband's life, uncovering revelations that throw into doubt everything she has ever believed about him. As her investigation leads her away from their fairytale romance into a place of violence and fear she must decide whether the secrets Mark has been keeping are designed to protect him or protect her.